Skullcap frame and guide



G. M. CRUSE.

SKULLCAP FRAME AND GUIDE.

APPLlCATlON FILEDFEB.9,1920.

Patentefl Nov. 29 1921..

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IN VEN TOR FATENT @FEFEQE.

GEORGE 1V1. CRUSE, OF STOCKTON, CALIFORNIA.

SKULLCAIP FRAME AND GUIDE.

Application filed February 9, 1920.

T 0 all whom it may concern:

Be it known that I, GEORGE M. CRUsn, a citizen of the United States, residing at Stockton, in the county of San Joaquin and State of California, have invented certain new and useful Improvements in Skullcap Frames and Guides, of which the following is a specification.

These specifications and with reference to the drawings, will enable others skilled in the art to which it appertains, to make and use the same.

This invention relates to new and useful improvements in skull cap frame and guide. The principal object of the invention is to provide an instrument for performing autopsy operations in post-mortem examinations.

Another object of the invention is to provide a guide for the cutting instrument used by the autopsy surgeon.

Another object of the invention is to provide a means for holding the cranium of the subject in a rigid position, when the operation is being performed.

Vith these, and other objects in view, the invention consists in the novel combination and arrangement of parts which will be fully set forth in the following specifica tions and accompanying drawings, in which:

Figure 1, is a plan view of the instrument.

Fig. 2, is a side View of the instrument.

Fig. 3, illustrates the use of the instrument in performing a post-mortem examina tion upon a subject.

Referring to the drawing the numeral 1 designates the base and guide ring, which is rectangular in section and being in two semi-circular sections, which, when assembled, produce an annular structure, on the outer circumference of which are formed bosses 2. These bosses 2, rigidly support the standards 3, at right angle to the face of the base and guide ring 1. In constructing the device, the object is to have the standards 3, in parallelism permitting the cross bar handle brackets 4:, to slide along the longitudinal axis of standards 3, the object being to permit adjustment of the distance between the face of the base and guide ring and the cross bar handle 5. The cross bar handle brackets are locked in position by set screws 12.

Should there be any irregularity in the Specification of Letters Patent.

Patented Nov. 29, 1921.

Serial No. 357,346.

parallelism of the standards 3, I have provided the cross bar handle 5, with an opening along its longitudinal axis a distance which in practice will be found necessary. VVit-hin this opening is fitted the cross bar 9. It will thus be readily seen the purpose of this construction is to compensate for any variation in parallelism between the two standards 3.

The base and guide ring 1, has a plurality of bosses 11*, on its outer circumference, which have threaded openings and to which are fitted the plurality adjusting screws 6, which are threaded and have a knurled head for adjusting.

The base and guide ring 1, has bosses 11, provided with openings and set screws 7, for the purpose of holding the base and guide ring adjusting bar 8, in position, after havin adjusted the base and guide ring.

aving described the various structural parts of my invention, I will give a description of the purpose and use of my invention.

The great difficulty in performing a postmortem operation, is to provide a guide for the cutting instrument, as well as means whereby the cranium of the subject can be rigidly held in the desired position during the operation. The device also acts as a holder for the part of the cranium which has been dissected.

In Fig. 3, the instrument is shown as it would be applied in performing the operation. The base and guide ring 1, is adjusted to the required size as herein before explained to fit over the craniiun of the subj ect to be operated upon. The points of the screw pins 6, are then set into the skull of the subject. This secures the base and guide ring. The face indicated by the letter a on the base and guide for the instrument which is being used to cut through the cranium. The device it will be seen can be used for holding the cranium in a rigid manner. The cross bar handle 5, serves the purpose of holding and turning the cranium. It also provides means of holding the instrument when it is being set in place.

I do not confine myself to any particular set form of construction, or to the use of any certain particular materials, it being the aim to vary structural features which in practice are found to be improvements without in any way detracting from the original scope of the invention.

A device of the character described, com

prising an annular base and guide member whlch is in two substantlally seml-circular sections, an ad ustable connection between the base and guide member, standards carried by the sections and positioned diametrically opposite each other, clamping members adjustablymounted on'the standards, and a handle barconnecting the clamping members said handle bar being composed of slidably connected sections.

said sections, set screws carried by the sec tions to project radially into the interior of In testimony whereof I affix my signature.

GEORGE M. CRUSE. 

